Smokescreen Brings Flash to iPad, iPhone

Smokescreen – iPad demo #1 from Chris @ RevShockAds on Vimeo.

Now that it’s clear that Apple has no intention of letting Adobe Flash run on the iPad or iPhone, workarounds for Flash are even more compelling to developers. Smokescreen, primarily by Chris Smoak, bypasses the need for the Flash plug-in by pulling in the SWF binaries and decompressing them in JavaScript, yanking out the images and audio and putting it all back together with the vector data rendered as animated SVG. Simon Willison got the details and posted the technical process on his blog:

It runs entirely in the browser, reads in SWF binaries, unzips them (in native JS), extracts images and embedded audio and turns them in to base64 encoded data:uris, then stitches the vector graphics back together as animated SVG. Open up the Chrome Web Inspector while the demo is running and you can see the SVG changing in real time. Smokescreen even implements its own ActionScript bytecode interpreter.

You can see demos of Smokescreen running StrongBad emails and ad banners at the site. If you are running Internet Explorer (any version), then these demos won’t work for you. In general, you’ll need the most recent versions of Firefox, Safari, Chrome or Opera to see the demos. A couple of them run on the iPad or iPhone and there is even a video of it in action for those who don’t have either device (see above).

The Flash movies don’t run quite as quickly using Smokescreen as they would in the native Flash player, but that’s to be expected when all the work is offloaded to the browser’s JavaScript engine (8,000 lines of code weighing in at 175kb). I also noticed that sometimes text embedded in the SWF file either didn’t appear at all or had some odd anti-aliasing. Given how new this is, however, I suspect these are surmountable obstacles. Given that Chris plans to release the code as open source, more developers will likely be able to contribute to pare this down.

What would make this even more interesting is if Adobe lent its support in some way. Since this has the potential to reverse the trepidation Flash developers now feel thanks to the increase in iPads and iPhones on the web, it may stave off any doomsday scenarios for Flash. It may also blow up Apple’s plans to ultimately push Flash out of the market altogether unless they want to stop supporting the JavaScript and HTML5 that this utility uses to render the former-Flash movies. It’s still too early to tell which way either company will go with this, if they do anything at all, but I suspect it will be interesting to watch.

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I test it and it is working, check


Yep, it does work, but the examples showed that already. It's nice to see someone playing around with it. I am particularly interested to see if it can ever work on IE (before IE9) and how well larger Flash movies might work on the iPad or iPhone.

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